Astrothelium corallinum
Astrothelium corallinum is a species of corticolous, crustose lichen in the family Trypetheliaceae. Found in Guyana, it was formally described as a new species in 2016 by André Aptroot. The type specimen was collected from Rain Mountain, southeast of the village in Paruima Mission at an altitude of ; here, it was found growing on the smooth bark of trees in a rainforest. The lichen has a smooth, somewhat shiny thallus that covers areas of up to in diameter; the entire thallus is surrounded by a thin black line that is the prothallus. The whitish parts of the pseudostromata will fluoresce yellow when lit with a long-wavelength UV light; this is due to the presence of lichexanthone, a lichen product. The thallus, however, does not contain lichexanthone, which distinguishes it from the similar species A. ochroleucoides.